1 // SPDX-License-Identifier: GPL-2.0 2 /* Target based USB-Gadget 3 * 4 * UAS protocol handling, target callbacks, configfs handling, 5 * BBB (USB Mass Storage Class Bulk-Only (BBB) and Transport protocol handling. 6 * 7 * Author: Sebastian Andrzej Siewior <bigeasy at linutronix dot de> 8 */ 9 #include <linux/kernel.h> 10 #include <linux/module.h> 11 #include <linux/types.h> 12 #include <linux/string.h> 13 #include <linux/configfs.h> 14 #include <linux/ctype.h> 15 #include <linux/usb/ch9.h> 16 #include <linux/usb/composite.h> 17 #include <linux/usb/gadget.h> 18 #include <linux/usb/storage.h> 19 #include <scsi/scsi_tcq.h> 20 #include <target/target_core_base.h> 21 #include <target/target_core_fabric.h> 22 #include <linux/unaligned.h> 23 24 #include "tcm.h" 25 #include "u_tcm.h" 26 #include "configfs.h" 27 28 #define TPG_INSTANCES 1 29 30 struct tpg_instance { 31 struct usb_function_instance *func_inst; 32 struct usbg_tpg *tpg; 33 }; 34 35 static struct tpg_instance tpg_instances[TPG_INSTANCES]; 36 37 static DEFINE_MUTEX(tpg_instances_lock); 38 39 static inline struct f_uas *to_f_uas(struct usb_function *f) 40 { 41 return container_of(f, struct f_uas, function); 42 } 43 44 /* Start bot.c code */ 45 46 static int bot_enqueue_cmd_cbw(struct f_uas *fu) 47 { 48 int ret; 49 50 if (fu->flags & USBG_BOT_CMD_PEND) 51 return 0; 52 53 ret = usb_ep_queue(fu->ep_out, fu->cmd[0].req, GFP_ATOMIC); 54 if (!ret) 55 fu->flags |= USBG_BOT_CMD_PEND; 56 return ret; 57 } 58 59 static void bot_status_complete(struct usb_ep *ep, struct usb_request *req) 60 { 61 struct usbg_cmd *cmd = req->context; 62 struct f_uas *fu = cmd->fu; 63 64 transport_generic_free_cmd(&cmd->se_cmd, 0); 65 if (req->status < 0) { 66 pr_err("ERR %s(%d)\n", __func__, __LINE__); 67 return; 68 } 69 70 /* CSW completed, wait for next CBW */ 71 bot_enqueue_cmd_cbw(fu); 72 } 73 74 static void bot_enqueue_sense_code(struct f_uas *fu, struct usbg_cmd *cmd) 75 { 76 struct bulk_cs_wrap *csw = &fu->bot_status.csw; 77 int ret; 78 unsigned int csw_stat; 79 80 csw_stat = cmd->csw_code; 81 csw->Tag = cmd->bot_tag; 82 csw->Status = csw_stat; 83 fu->bot_status.req->context = cmd; 84 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_ATOMIC); 85 if (ret) 86 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret); 87 } 88 89 static void bot_err_compl(struct usb_ep *ep, struct usb_request *req) 90 { 91 struct usbg_cmd *cmd = req->context; 92 struct f_uas *fu = cmd->fu; 93 94 if (req->status < 0) 95 pr_err("ERR %s(%d)\n", __func__, __LINE__); 96 97 if (cmd->data_len) { 98 if (cmd->data_len > ep->maxpacket) { 99 req->length = ep->maxpacket; 100 cmd->data_len -= ep->maxpacket; 101 } else { 102 req->length = cmd->data_len; 103 cmd->data_len = 0; 104 } 105 106 usb_ep_queue(ep, req, GFP_ATOMIC); 107 return; 108 } 109 bot_enqueue_sense_code(fu, cmd); 110 } 111 112 static void bot_send_bad_status(struct usbg_cmd *cmd) 113 { 114 struct f_uas *fu = cmd->fu; 115 struct bulk_cs_wrap *csw = &fu->bot_status.csw; 116 struct usb_request *req; 117 struct usb_ep *ep; 118 119 csw->Residue = cpu_to_le32(cmd->data_len); 120 121 if (cmd->data_len) { 122 if (cmd->is_read) { 123 ep = fu->ep_in; 124 req = fu->bot_req_in; 125 } else { 126 ep = fu->ep_out; 127 req = fu->bot_req_out; 128 } 129 130 if (cmd->data_len > fu->ep_in->maxpacket) { 131 req->length = ep->maxpacket; 132 cmd->data_len -= ep->maxpacket; 133 } else { 134 req->length = cmd->data_len; 135 cmd->data_len = 0; 136 } 137 req->complete = bot_err_compl; 138 req->context = cmd; 139 req->buf = fu->cmd[0].buf; 140 usb_ep_queue(ep, req, GFP_KERNEL); 141 } else { 142 bot_enqueue_sense_code(fu, cmd); 143 } 144 } 145 146 static int bot_send_status(struct usbg_cmd *cmd, bool moved_data) 147 { 148 struct f_uas *fu = cmd->fu; 149 struct bulk_cs_wrap *csw = &fu->bot_status.csw; 150 int ret; 151 152 if (cmd->se_cmd.scsi_status == SAM_STAT_GOOD) { 153 if (!moved_data && cmd->data_len) { 154 /* 155 * the host wants to move data, we don't. Fill / empty 156 * the pipe and then send the csw with reside set. 157 */ 158 cmd->csw_code = US_BULK_STAT_OK; 159 bot_send_bad_status(cmd); 160 return 0; 161 } 162 163 csw->Tag = cmd->bot_tag; 164 csw->Residue = cpu_to_le32(0); 165 csw->Status = US_BULK_STAT_OK; 166 fu->bot_status.req->context = cmd; 167 168 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_KERNEL); 169 if (ret) 170 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret); 171 } else { 172 cmd->csw_code = US_BULK_STAT_FAIL; 173 bot_send_bad_status(cmd); 174 } 175 return 0; 176 } 177 178 /* 179 * Called after command (no data transfer) or after the write (to device) 180 * operation is completed 181 */ 182 static int bot_send_status_response(struct usbg_cmd *cmd) 183 { 184 bool moved_data = false; 185 186 if (!cmd->is_read) 187 moved_data = true; 188 return bot_send_status(cmd, moved_data); 189 } 190 191 /* Read request completed, now we have to send the CSW */ 192 static void bot_read_compl(struct usb_ep *ep, struct usb_request *req) 193 { 194 struct usbg_cmd *cmd = req->context; 195 196 if (req->status < 0) 197 pr_err("ERR %s(%d)\n", __func__, __LINE__); 198 199 bot_send_status(cmd, true); 200 } 201 202 static int bot_send_read_response(struct usbg_cmd *cmd) 203 { 204 struct f_uas *fu = cmd->fu; 205 struct se_cmd *se_cmd = &cmd->se_cmd; 206 struct usb_gadget *gadget = fuas_to_gadget(fu); 207 int ret; 208 209 if (!cmd->data_len) { 210 cmd->csw_code = US_BULK_STAT_PHASE; 211 bot_send_bad_status(cmd); 212 return 0; 213 } 214 215 if (!gadget->sg_supported) { 216 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC); 217 if (!cmd->data_buf) 218 return -ENOMEM; 219 220 sg_copy_to_buffer(se_cmd->t_data_sg, 221 se_cmd->t_data_nents, 222 cmd->data_buf, 223 se_cmd->data_length); 224 225 fu->bot_req_in->buf = cmd->data_buf; 226 } else { 227 fu->bot_req_in->buf = NULL; 228 fu->bot_req_in->num_sgs = se_cmd->t_data_nents; 229 fu->bot_req_in->sg = se_cmd->t_data_sg; 230 } 231 232 fu->bot_req_in->complete = bot_read_compl; 233 fu->bot_req_in->length = se_cmd->data_length; 234 fu->bot_req_in->context = cmd; 235 ret = usb_ep_queue(fu->ep_in, fu->bot_req_in, GFP_ATOMIC); 236 if (ret) 237 pr_err("%s(%d)\n", __func__, __LINE__); 238 return 0; 239 } 240 241 static void usbg_data_write_cmpl(struct usb_ep *, struct usb_request *); 242 static int usbg_prepare_w_request(struct usbg_cmd *, struct usb_request *); 243 244 static int bot_send_write_request(struct usbg_cmd *cmd) 245 { 246 struct f_uas *fu = cmd->fu; 247 struct se_cmd *se_cmd = &cmd->se_cmd; 248 int ret; 249 250 init_completion(&cmd->write_complete); 251 cmd->fu = fu; 252 253 if (!cmd->data_len) { 254 cmd->csw_code = US_BULK_STAT_PHASE; 255 return -EINVAL; 256 } 257 258 ret = usbg_prepare_w_request(cmd, fu->bot_req_out); 259 if (ret) 260 goto cleanup; 261 ret = usb_ep_queue(fu->ep_out, fu->bot_req_out, GFP_KERNEL); 262 if (ret) 263 pr_err("%s(%d)\n", __func__, __LINE__); 264 265 wait_for_completion(&cmd->write_complete); 266 target_execute_cmd(se_cmd); 267 cleanup: 268 return ret; 269 } 270 271 static int bot_submit_command(struct f_uas *, void *, unsigned int); 272 273 static void bot_cmd_complete(struct usb_ep *ep, struct usb_request *req) 274 { 275 struct f_uas *fu = req->context; 276 int ret; 277 278 fu->flags &= ~USBG_BOT_CMD_PEND; 279 280 if (req->status < 0) 281 return; 282 283 ret = bot_submit_command(fu, req->buf, req->actual); 284 if (ret) 285 pr_err("%s(%d): %d\n", __func__, __LINE__, ret); 286 } 287 288 static int bot_prepare_reqs(struct f_uas *fu) 289 { 290 int ret; 291 292 fu->bot_req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL); 293 if (!fu->bot_req_in) 294 goto err; 295 296 fu->bot_req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL); 297 if (!fu->bot_req_out) 298 goto err_out; 299 300 fu->cmd[0].req = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL); 301 if (!fu->cmd[0].req) 302 goto err_cmd; 303 304 fu->bot_status.req = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL); 305 if (!fu->bot_status.req) 306 goto err_sts; 307 308 fu->bot_status.req->buf = &fu->bot_status.csw; 309 fu->bot_status.req->length = US_BULK_CS_WRAP_LEN; 310 fu->bot_status.req->complete = bot_status_complete; 311 fu->bot_status.csw.Signature = cpu_to_le32(US_BULK_CS_SIGN); 312 313 fu->cmd[0].buf = kmalloc(fu->ep_out->maxpacket, GFP_KERNEL); 314 if (!fu->cmd[0].buf) 315 goto err_buf; 316 317 fu->cmd[0].req->complete = bot_cmd_complete; 318 fu->cmd[0].req->buf = fu->cmd[0].buf; 319 fu->cmd[0].req->length = fu->ep_out->maxpacket; 320 fu->cmd[0].req->context = fu; 321 322 ret = bot_enqueue_cmd_cbw(fu); 323 if (ret) 324 goto err_queue; 325 return 0; 326 err_queue: 327 kfree(fu->cmd[0].buf); 328 fu->cmd[0].buf = NULL; 329 err_buf: 330 usb_ep_free_request(fu->ep_in, fu->bot_status.req); 331 err_sts: 332 usb_ep_free_request(fu->ep_out, fu->cmd[0].req); 333 fu->cmd[0].req = NULL; 334 err_cmd: 335 usb_ep_free_request(fu->ep_out, fu->bot_req_out); 336 fu->bot_req_out = NULL; 337 err_out: 338 usb_ep_free_request(fu->ep_in, fu->bot_req_in); 339 fu->bot_req_in = NULL; 340 err: 341 pr_err("BOT: endpoint setup failed\n"); 342 return -ENOMEM; 343 } 344 345 static void bot_cleanup_old_alt(struct f_uas *fu) 346 { 347 if (!(fu->flags & USBG_ENABLED)) 348 return; 349 350 usb_ep_disable(fu->ep_in); 351 usb_ep_disable(fu->ep_out); 352 353 if (!fu->bot_req_in) 354 return; 355 356 usb_ep_free_request(fu->ep_in, fu->bot_req_in); 357 usb_ep_free_request(fu->ep_out, fu->bot_req_out); 358 usb_ep_free_request(fu->ep_out, fu->cmd[0].req); 359 usb_ep_free_request(fu->ep_in, fu->bot_status.req); 360 361 kfree(fu->cmd[0].buf); 362 363 fu->bot_req_in = NULL; 364 fu->bot_req_out = NULL; 365 fu->cmd[0].req = NULL; 366 fu->bot_status.req = NULL; 367 fu->cmd[0].buf = NULL; 368 } 369 370 static void bot_set_alt(struct f_uas *fu) 371 { 372 struct usb_function *f = &fu->function; 373 struct usb_gadget *gadget = f->config->cdev->gadget; 374 int ret; 375 376 fu->flags = USBG_IS_BOT; 377 378 config_ep_by_speed_and_alt(gadget, f, fu->ep_in, USB_G_ALT_INT_BBB); 379 ret = usb_ep_enable(fu->ep_in); 380 if (ret) 381 goto err_b_in; 382 383 config_ep_by_speed_and_alt(gadget, f, fu->ep_out, USB_G_ALT_INT_BBB); 384 ret = usb_ep_enable(fu->ep_out); 385 if (ret) 386 goto err_b_out; 387 388 ret = bot_prepare_reqs(fu); 389 if (ret) 390 goto err_wq; 391 fu->flags |= USBG_ENABLED; 392 pr_info("Using the BOT protocol\n"); 393 return; 394 err_wq: 395 usb_ep_disable(fu->ep_out); 396 err_b_out: 397 usb_ep_disable(fu->ep_in); 398 err_b_in: 399 fu->flags = USBG_IS_BOT; 400 } 401 402 static int usbg_bot_setup(struct usb_function *f, 403 const struct usb_ctrlrequest *ctrl) 404 { 405 struct f_uas *fu = to_f_uas(f); 406 struct usb_composite_dev *cdev = f->config->cdev; 407 u16 w_value = le16_to_cpu(ctrl->wValue); 408 u16 w_length = le16_to_cpu(ctrl->wLength); 409 int luns; 410 u8 *ret_lun; 411 412 switch (ctrl->bRequest) { 413 case US_BULK_GET_MAX_LUN: 414 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_CLASS | 415 USB_RECIP_INTERFACE)) 416 return -ENOTSUPP; 417 418 if (w_length < 1) 419 return -EINVAL; 420 if (w_value != 0) 421 return -EINVAL; 422 luns = atomic_read(&fu->tpg->tpg_port_count); 423 if (!luns) { 424 pr_err("No LUNs configured?\n"); 425 return -EINVAL; 426 } 427 luns--; 428 if (luns > US_BULK_MAX_LUN_LIMIT) { 429 pr_info_once("Limiting the number of luns to 16\n"); 430 luns = US_BULK_MAX_LUN_LIMIT; 431 } 432 ret_lun = cdev->req->buf; 433 *ret_lun = luns; 434 cdev->req->length = 1; 435 return usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC); 436 437 case US_BULK_RESET_REQUEST: 438 /* XXX maybe we should remove previous requests for IN + OUT */ 439 bot_enqueue_cmd_cbw(fu); 440 return 0; 441 } 442 return -ENOTSUPP; 443 } 444 445 /* Start uas.c code */ 446 447 static void uasp_cleanup_one_stream(struct f_uas *fu, struct uas_stream *stream) 448 { 449 /* We have either all three allocated or none */ 450 if (!stream->req_in) 451 return; 452 453 usb_ep_free_request(fu->ep_in, stream->req_in); 454 usb_ep_free_request(fu->ep_out, stream->req_out); 455 usb_ep_free_request(fu->ep_status, stream->req_status); 456 457 stream->req_in = NULL; 458 stream->req_out = NULL; 459 stream->req_status = NULL; 460 } 461 462 static void uasp_free_cmdreq(struct f_uas *fu) 463 { 464 int i; 465 466 for (i = 0; i < USBG_NUM_CMDS; i++) { 467 usb_ep_free_request(fu->ep_cmd, fu->cmd[i].req); 468 kfree(fu->cmd[i].buf); 469 fu->cmd[i].req = NULL; 470 fu->cmd[i].buf = NULL; 471 } 472 } 473 474 static void uasp_cleanup_old_alt(struct f_uas *fu) 475 { 476 int i; 477 478 if (!(fu->flags & USBG_ENABLED)) 479 return; 480 481 usb_ep_disable(fu->ep_in); 482 usb_ep_disable(fu->ep_out); 483 usb_ep_disable(fu->ep_status); 484 usb_ep_disable(fu->ep_cmd); 485 486 for (i = 0; i < USBG_NUM_CMDS; i++) 487 uasp_cleanup_one_stream(fu, &fu->stream[i]); 488 uasp_free_cmdreq(fu); 489 } 490 491 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req); 492 493 static int uasp_prepare_r_request(struct usbg_cmd *cmd) 494 { 495 struct se_cmd *se_cmd = &cmd->se_cmd; 496 struct f_uas *fu = cmd->fu; 497 struct usb_gadget *gadget = fuas_to_gadget(fu); 498 struct uas_stream *stream = &fu->stream[se_cmd->map_tag]; 499 500 if (!gadget->sg_supported) { 501 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC); 502 if (!cmd->data_buf) 503 return -ENOMEM; 504 505 sg_copy_to_buffer(se_cmd->t_data_sg, 506 se_cmd->t_data_nents, 507 cmd->data_buf, 508 se_cmd->data_length); 509 510 stream->req_in->buf = cmd->data_buf; 511 } else { 512 stream->req_in->buf = NULL; 513 stream->req_in->num_sgs = se_cmd->t_data_nents; 514 stream->req_in->sg = se_cmd->t_data_sg; 515 } 516 517 stream->req_in->is_last = 1; 518 stream->req_in->stream_id = cmd->tag; 519 stream->req_in->complete = uasp_status_data_cmpl; 520 stream->req_in->length = se_cmd->data_length; 521 stream->req_in->context = cmd; 522 523 cmd->state = UASP_SEND_STATUS; 524 return 0; 525 } 526 527 static void uasp_prepare_status(struct usbg_cmd *cmd) 528 { 529 struct se_cmd *se_cmd = &cmd->se_cmd; 530 struct sense_iu *iu = &cmd->sense_iu; 531 struct uas_stream *stream = &cmd->fu->stream[se_cmd->map_tag]; 532 533 cmd->state = UASP_QUEUE_COMMAND; 534 iu->iu_id = IU_ID_STATUS; 535 iu->tag = cpu_to_be16(cmd->tag); 536 537 /* 538 * iu->status_qual = cpu_to_be16(STATUS QUALIFIER SAM-4. Where R U?); 539 */ 540 iu->len = cpu_to_be16(se_cmd->scsi_sense_length); 541 iu->status = se_cmd->scsi_status; 542 stream->req_status->is_last = 1; 543 stream->req_status->stream_id = cmd->tag; 544 stream->req_status->context = cmd; 545 stream->req_status->length = se_cmd->scsi_sense_length + 16; 546 stream->req_status->buf = iu; 547 stream->req_status->complete = uasp_status_data_cmpl; 548 } 549 550 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req) 551 { 552 struct usbg_cmd *cmd = req->context; 553 struct f_uas *fu = cmd->fu; 554 struct uas_stream *stream = &fu->stream[cmd->se_cmd.map_tag]; 555 int ret; 556 557 if (req->status < 0) 558 goto cleanup; 559 560 switch (cmd->state) { 561 case UASP_SEND_DATA: 562 ret = uasp_prepare_r_request(cmd); 563 if (ret) 564 goto cleanup; 565 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC); 566 if (ret) 567 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); 568 break; 569 570 case UASP_RECEIVE_DATA: 571 ret = usbg_prepare_w_request(cmd, stream->req_out); 572 if (ret) 573 goto cleanup; 574 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC); 575 if (ret) 576 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); 577 break; 578 579 case UASP_SEND_STATUS: 580 uasp_prepare_status(cmd); 581 ret = usb_ep_queue(fu->ep_status, stream->req_status, 582 GFP_ATOMIC); 583 if (ret) 584 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); 585 break; 586 587 case UASP_QUEUE_COMMAND: 588 transport_generic_free_cmd(&cmd->se_cmd, 0); 589 usb_ep_queue(fu->ep_cmd, cmd->req, GFP_ATOMIC); 590 591 break; 592 593 default: 594 BUG(); 595 } 596 return; 597 598 cleanup: 599 transport_generic_free_cmd(&cmd->se_cmd, 0); 600 } 601 602 static int uasp_send_status_response(struct usbg_cmd *cmd) 603 { 604 struct f_uas *fu = cmd->fu; 605 struct uas_stream *stream = &fu->stream[cmd->se_cmd.map_tag]; 606 struct sense_iu *iu = &cmd->sense_iu; 607 608 iu->tag = cpu_to_be16(cmd->tag); 609 stream->req_status->complete = uasp_status_data_cmpl; 610 stream->req_status->context = cmd; 611 cmd->fu = fu; 612 uasp_prepare_status(cmd); 613 return usb_ep_queue(fu->ep_status, stream->req_status, GFP_ATOMIC); 614 } 615 616 static int uasp_send_read_response(struct usbg_cmd *cmd) 617 { 618 struct f_uas *fu = cmd->fu; 619 struct uas_stream *stream = &fu->stream[cmd->se_cmd.map_tag]; 620 struct sense_iu *iu = &cmd->sense_iu; 621 int ret; 622 623 cmd->fu = fu; 624 625 iu->tag = cpu_to_be16(cmd->tag); 626 if (fu->flags & USBG_USE_STREAMS) { 627 628 ret = uasp_prepare_r_request(cmd); 629 if (ret) 630 goto out; 631 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC); 632 if (ret) { 633 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); 634 kfree(cmd->data_buf); 635 cmd->data_buf = NULL; 636 } 637 638 } else { 639 640 iu->iu_id = IU_ID_READ_READY; 641 iu->tag = cpu_to_be16(cmd->tag); 642 643 stream->req_status->complete = uasp_status_data_cmpl; 644 stream->req_status->context = cmd; 645 646 cmd->state = UASP_SEND_DATA; 647 stream->req_status->buf = iu; 648 stream->req_status->length = sizeof(struct iu); 649 650 ret = usb_ep_queue(fu->ep_status, stream->req_status, 651 GFP_ATOMIC); 652 if (ret) 653 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); 654 } 655 out: 656 return ret; 657 } 658 659 static int uasp_send_write_request(struct usbg_cmd *cmd) 660 { 661 struct f_uas *fu = cmd->fu; 662 struct se_cmd *se_cmd = &cmd->se_cmd; 663 struct uas_stream *stream = &fu->stream[se_cmd->map_tag]; 664 struct sense_iu *iu = &cmd->sense_iu; 665 int ret; 666 667 init_completion(&cmd->write_complete); 668 cmd->fu = fu; 669 670 iu->tag = cpu_to_be16(cmd->tag); 671 672 if (fu->flags & USBG_USE_STREAMS) { 673 674 ret = usbg_prepare_w_request(cmd, stream->req_out); 675 if (ret) 676 goto cleanup; 677 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC); 678 if (ret) 679 pr_err("%s(%d)\n", __func__, __LINE__); 680 681 } else { 682 683 iu->iu_id = IU_ID_WRITE_READY; 684 iu->tag = cpu_to_be16(cmd->tag); 685 686 stream->req_status->complete = uasp_status_data_cmpl; 687 stream->req_status->context = cmd; 688 689 cmd->state = UASP_RECEIVE_DATA; 690 stream->req_status->buf = iu; 691 stream->req_status->length = sizeof(struct iu); 692 693 ret = usb_ep_queue(fu->ep_status, stream->req_status, 694 GFP_ATOMIC); 695 if (ret) 696 pr_err("%s(%d)\n", __func__, __LINE__); 697 } 698 699 wait_for_completion(&cmd->write_complete); 700 target_execute_cmd(se_cmd); 701 cleanup: 702 return ret; 703 } 704 705 static int usbg_submit_command(struct f_uas *, struct usb_request *); 706 707 static void uasp_cmd_complete(struct usb_ep *ep, struct usb_request *req) 708 { 709 struct f_uas *fu = req->context; 710 711 if (req->status == -ESHUTDOWN) 712 return; 713 714 if (req->status < 0) { 715 usb_ep_queue(fu->ep_cmd, req, GFP_ATOMIC); 716 return; 717 } 718 719 usbg_submit_command(fu, req); 720 } 721 722 static int uasp_alloc_stream_res(struct f_uas *fu, struct uas_stream *stream) 723 { 724 stream->req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL); 725 if (!stream->req_in) 726 goto out; 727 728 stream->req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL); 729 if (!stream->req_out) 730 goto err_out; 731 732 stream->req_status = usb_ep_alloc_request(fu->ep_status, GFP_KERNEL); 733 if (!stream->req_status) 734 goto err_sts; 735 736 return 0; 737 738 err_sts: 739 usb_ep_free_request(fu->ep_out, stream->req_out); 740 stream->req_out = NULL; 741 err_out: 742 usb_ep_free_request(fu->ep_in, stream->req_in); 743 stream->req_in = NULL; 744 out: 745 return -ENOMEM; 746 } 747 748 static int uasp_alloc_cmd(struct f_uas *fu, int i) 749 { 750 fu->cmd[i].req = usb_ep_alloc_request(fu->ep_cmd, GFP_KERNEL); 751 if (!fu->cmd[i].req) 752 goto err; 753 754 fu->cmd[i].buf = kmalloc(fu->ep_cmd->maxpacket, GFP_KERNEL); 755 if (!fu->cmd[i].buf) 756 goto err_buf; 757 758 fu->cmd[i].req->complete = uasp_cmd_complete; 759 fu->cmd[i].req->buf = fu->cmd[i].buf; 760 fu->cmd[i].req->length = fu->ep_cmd->maxpacket; 761 fu->cmd[i].req->context = fu; 762 return 0; 763 764 err_buf: 765 usb_ep_free_request(fu->ep_cmd, fu->cmd[i].req); 766 err: 767 return -ENOMEM; 768 } 769 770 static int uasp_prepare_reqs(struct f_uas *fu) 771 { 772 int ret; 773 int i; 774 775 for (i = 0; i < USBG_NUM_CMDS; i++) { 776 ret = uasp_alloc_stream_res(fu, &fu->stream[i]); 777 if (ret) 778 goto err_cleanup; 779 } 780 781 for (i = 0; i < USBG_NUM_CMDS; i++) { 782 ret = uasp_alloc_cmd(fu, i); 783 if (ret) 784 goto err_free_stream; 785 786 ret = usb_ep_queue(fu->ep_cmd, fu->cmd[i].req, GFP_ATOMIC); 787 if (ret) 788 goto err_free_stream; 789 } 790 791 return 0; 792 793 err_free_stream: 794 uasp_free_cmdreq(fu); 795 796 err_cleanup: 797 if (i) { 798 do { 799 uasp_cleanup_one_stream(fu, &fu->stream[i - 1]); 800 i--; 801 } while (i); 802 } 803 pr_err("UASP: endpoint setup failed\n"); 804 return ret; 805 } 806 807 static void uasp_set_alt(struct f_uas *fu) 808 { 809 struct usb_function *f = &fu->function; 810 struct usb_gadget *gadget = f->config->cdev->gadget; 811 int ret; 812 813 fu->flags = USBG_IS_UAS; 814 815 if (gadget->speed >= USB_SPEED_SUPER) 816 fu->flags |= USBG_USE_STREAMS; 817 818 config_ep_by_speed_and_alt(gadget, f, fu->ep_in, USB_G_ALT_INT_UAS); 819 ret = usb_ep_enable(fu->ep_in); 820 if (ret) 821 goto err_b_in; 822 823 config_ep_by_speed_and_alt(gadget, f, fu->ep_out, USB_G_ALT_INT_UAS); 824 ret = usb_ep_enable(fu->ep_out); 825 if (ret) 826 goto err_b_out; 827 828 config_ep_by_speed_and_alt(gadget, f, fu->ep_cmd, USB_G_ALT_INT_UAS); 829 ret = usb_ep_enable(fu->ep_cmd); 830 if (ret) 831 goto err_cmd; 832 config_ep_by_speed_and_alt(gadget, f, fu->ep_status, USB_G_ALT_INT_UAS); 833 ret = usb_ep_enable(fu->ep_status); 834 if (ret) 835 goto err_status; 836 837 ret = uasp_prepare_reqs(fu); 838 if (ret) 839 goto err_wq; 840 fu->flags |= USBG_ENABLED; 841 842 pr_info("Using the UAS protocol\n"); 843 return; 844 err_wq: 845 usb_ep_disable(fu->ep_status); 846 err_status: 847 usb_ep_disable(fu->ep_cmd); 848 err_cmd: 849 usb_ep_disable(fu->ep_out); 850 err_b_out: 851 usb_ep_disable(fu->ep_in); 852 err_b_in: 853 fu->flags = 0; 854 } 855 856 static int get_cmd_dir(const unsigned char *cdb) 857 { 858 int ret; 859 860 switch (cdb[0]) { 861 case READ_6: 862 case READ_10: 863 case READ_12: 864 case READ_16: 865 case INQUIRY: 866 case MODE_SENSE: 867 case MODE_SENSE_10: 868 case SERVICE_ACTION_IN_16: 869 case MAINTENANCE_IN: 870 case PERSISTENT_RESERVE_IN: 871 case SECURITY_PROTOCOL_IN: 872 case ACCESS_CONTROL_IN: 873 case REPORT_LUNS: 874 case READ_BLOCK_LIMITS: 875 case READ_POSITION: 876 case READ_CAPACITY: 877 case READ_TOC: 878 case READ_FORMAT_CAPACITIES: 879 case REQUEST_SENSE: 880 case ATA_12: 881 case ATA_16: 882 ret = DMA_FROM_DEVICE; 883 break; 884 885 case WRITE_6: 886 case WRITE_10: 887 case WRITE_12: 888 case WRITE_16: 889 case MODE_SELECT: 890 case MODE_SELECT_10: 891 case WRITE_VERIFY: 892 case WRITE_VERIFY_12: 893 case PERSISTENT_RESERVE_OUT: 894 case MAINTENANCE_OUT: 895 case SECURITY_PROTOCOL_OUT: 896 case ACCESS_CONTROL_OUT: 897 ret = DMA_TO_DEVICE; 898 break; 899 case ALLOW_MEDIUM_REMOVAL: 900 case TEST_UNIT_READY: 901 case SYNCHRONIZE_CACHE: 902 case START_STOP: 903 case ERASE: 904 case REZERO_UNIT: 905 case SEEK_10: 906 case SPACE: 907 case VERIFY: 908 case WRITE_FILEMARKS: 909 ret = DMA_NONE; 910 break; 911 default: 912 #define CMD_DIR_MSG "target: Unknown data direction for SCSI Opcode 0x%02x\n" 913 pr_warn(CMD_DIR_MSG, cdb[0]); 914 #undef CMD_DIR_MSG 915 ret = -EINVAL; 916 } 917 return ret; 918 } 919 920 static void usbg_data_write_cmpl(struct usb_ep *ep, struct usb_request *req) 921 { 922 struct usbg_cmd *cmd = req->context; 923 struct se_cmd *se_cmd = &cmd->se_cmd; 924 925 if (req->status < 0) { 926 pr_err("%s() state %d transfer failed\n", __func__, cmd->state); 927 goto cleanup; 928 } 929 930 if (req->num_sgs == 0) { 931 sg_copy_from_buffer(se_cmd->t_data_sg, 932 se_cmd->t_data_nents, 933 cmd->data_buf, 934 se_cmd->data_length); 935 } 936 937 complete(&cmd->write_complete); 938 return; 939 940 cleanup: 941 target_put_sess_cmd(se_cmd); 942 transport_generic_free_cmd(&cmd->se_cmd, 0); 943 } 944 945 static int usbg_prepare_w_request(struct usbg_cmd *cmd, struct usb_request *req) 946 { 947 struct se_cmd *se_cmd = &cmd->se_cmd; 948 struct f_uas *fu = cmd->fu; 949 struct usb_gadget *gadget = fuas_to_gadget(fu); 950 951 if (!gadget->sg_supported) { 952 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC); 953 if (!cmd->data_buf) 954 return -ENOMEM; 955 956 req->buf = cmd->data_buf; 957 } else { 958 req->buf = NULL; 959 req->num_sgs = se_cmd->t_data_nents; 960 req->sg = se_cmd->t_data_sg; 961 } 962 963 req->is_last = 1; 964 req->stream_id = cmd->tag; 965 req->complete = usbg_data_write_cmpl; 966 req->length = se_cmd->data_length; 967 req->context = cmd; 968 return 0; 969 } 970 971 static int usbg_send_status_response(struct se_cmd *se_cmd) 972 { 973 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, 974 se_cmd); 975 struct f_uas *fu = cmd->fu; 976 977 if (fu->flags & USBG_IS_BOT) 978 return bot_send_status_response(cmd); 979 else 980 return uasp_send_status_response(cmd); 981 } 982 983 static int usbg_send_write_request(struct se_cmd *se_cmd) 984 { 985 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, 986 se_cmd); 987 struct f_uas *fu = cmd->fu; 988 989 if (fu->flags & USBG_IS_BOT) 990 return bot_send_write_request(cmd); 991 else 992 return uasp_send_write_request(cmd); 993 } 994 995 static int usbg_send_read_response(struct se_cmd *se_cmd) 996 { 997 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, 998 se_cmd); 999 struct f_uas *fu = cmd->fu; 1000 1001 if (fu->flags & USBG_IS_BOT) 1002 return bot_send_read_response(cmd); 1003 else 1004 return uasp_send_read_response(cmd); 1005 } 1006 1007 static void usbg_cmd_work(struct work_struct *work) 1008 { 1009 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work); 1010 struct se_cmd *se_cmd; 1011 struct tcm_usbg_nexus *tv_nexus; 1012 struct usbg_tpg *tpg; 1013 int dir, flags = (TARGET_SCF_UNKNOWN_SIZE | TARGET_SCF_ACK_KREF); 1014 1015 se_cmd = &cmd->se_cmd; 1016 tpg = cmd->fu->tpg; 1017 tv_nexus = tpg->tpg_nexus; 1018 dir = get_cmd_dir(cmd->cmd_buf); 1019 if (dir < 0) { 1020 __target_init_cmd(se_cmd, 1021 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo, 1022 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE, 1023 cmd->prio_attr, cmd->sense_iu.sense, 1024 cmd->unpacked_lun, NULL); 1025 goto out; 1026 } 1027 1028 target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess, cmd->cmd_buf, 1029 cmd->sense_iu.sense, cmd->unpacked_lun, 0, 1030 cmd->prio_attr, dir, flags); 1031 return; 1032 1033 out: 1034 transport_send_check_condition_and_sense(se_cmd, 1035 TCM_UNSUPPORTED_SCSI_OPCODE, 0); 1036 } 1037 1038 static struct usbg_cmd *usbg_get_cmd(struct f_uas *fu, 1039 struct tcm_usbg_nexus *tv_nexus, u32 scsi_tag) 1040 { 1041 struct se_session *se_sess = tv_nexus->tvn_se_sess; 1042 struct usbg_cmd *cmd; 1043 int tag, cpu; 1044 1045 tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu); 1046 if (tag < 0) 1047 return ERR_PTR(-ENOMEM); 1048 1049 cmd = &((struct usbg_cmd *)se_sess->sess_cmd_map)[tag]; 1050 memset(cmd, 0, sizeof(*cmd)); 1051 cmd->se_cmd.map_tag = tag; 1052 cmd->se_cmd.map_cpu = cpu; 1053 cmd->se_cmd.tag = cmd->tag = scsi_tag; 1054 cmd->fu = fu; 1055 1056 return cmd; 1057 } 1058 1059 static void usbg_release_cmd(struct se_cmd *); 1060 1061 static int usbg_submit_command(struct f_uas *fu, struct usb_request *req) 1062 { 1063 struct command_iu *cmd_iu = req->buf; 1064 struct usbg_cmd *cmd; 1065 struct usbg_tpg *tpg = fu->tpg; 1066 struct tcm_usbg_nexus *tv_nexus; 1067 u32 cmd_len; 1068 u16 scsi_tag; 1069 1070 if (cmd_iu->iu_id != IU_ID_COMMAND) { 1071 pr_err("Unsupported type %d\n", cmd_iu->iu_id); 1072 return -EINVAL; 1073 } 1074 1075 tv_nexus = tpg->tpg_nexus; 1076 if (!tv_nexus) { 1077 pr_err("Missing nexus, ignoring command\n"); 1078 return -EINVAL; 1079 } 1080 1081 cmd_len = (cmd_iu->len & ~0x3) + 16; 1082 if (cmd_len > USBG_MAX_CMD) 1083 return -EINVAL; 1084 1085 scsi_tag = be16_to_cpup(&cmd_iu->tag); 1086 cmd = usbg_get_cmd(fu, tv_nexus, scsi_tag); 1087 if (IS_ERR(cmd)) { 1088 pr_err("usbg_get_cmd failed\n"); 1089 return -ENOMEM; 1090 } 1091 memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len); 1092 1093 switch (cmd_iu->prio_attr & 0x7) { 1094 case UAS_HEAD_TAG: 1095 cmd->prio_attr = TCM_HEAD_TAG; 1096 break; 1097 case UAS_ORDERED_TAG: 1098 cmd->prio_attr = TCM_ORDERED_TAG; 1099 break; 1100 case UAS_ACA: 1101 cmd->prio_attr = TCM_ACA_TAG; 1102 break; 1103 default: 1104 pr_debug_once("Unsupported prio_attr: %02x.\n", 1105 cmd_iu->prio_attr); 1106 fallthrough; 1107 case UAS_SIMPLE_TAG: 1108 cmd->prio_attr = TCM_SIMPLE_TAG; 1109 break; 1110 } 1111 1112 cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun); 1113 cmd->req = req; 1114 1115 INIT_WORK(&cmd->work, usbg_cmd_work); 1116 queue_work(tpg->workqueue, &cmd->work); 1117 1118 return 0; 1119 } 1120 1121 static void bot_cmd_work(struct work_struct *work) 1122 { 1123 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work); 1124 struct se_cmd *se_cmd; 1125 struct tcm_usbg_nexus *tv_nexus; 1126 struct usbg_tpg *tpg; 1127 int dir; 1128 1129 se_cmd = &cmd->se_cmd; 1130 tpg = cmd->fu->tpg; 1131 tv_nexus = tpg->tpg_nexus; 1132 dir = get_cmd_dir(cmd->cmd_buf); 1133 if (dir < 0) { 1134 __target_init_cmd(se_cmd, 1135 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo, 1136 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE, 1137 cmd->prio_attr, cmd->sense_iu.sense, 1138 cmd->unpacked_lun, NULL); 1139 goto out; 1140 } 1141 1142 target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess, 1143 cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun, 1144 cmd->data_len, cmd->prio_attr, dir, 0); 1145 return; 1146 1147 out: 1148 transport_send_check_condition_and_sense(se_cmd, 1149 TCM_UNSUPPORTED_SCSI_OPCODE, 0); 1150 } 1151 1152 static int bot_submit_command(struct f_uas *fu, 1153 void *cmdbuf, unsigned int len) 1154 { 1155 struct bulk_cb_wrap *cbw = cmdbuf; 1156 struct usbg_cmd *cmd; 1157 struct usbg_tpg *tpg = fu->tpg; 1158 struct tcm_usbg_nexus *tv_nexus; 1159 u32 cmd_len; 1160 1161 if (cbw->Signature != cpu_to_le32(US_BULK_CB_SIGN)) { 1162 pr_err("Wrong signature on CBW\n"); 1163 return -EINVAL; 1164 } 1165 if (len != 31) { 1166 pr_err("Wrong length for CBW\n"); 1167 return -EINVAL; 1168 } 1169 1170 cmd_len = cbw->Length; 1171 if (cmd_len < 1 || cmd_len > 16) 1172 return -EINVAL; 1173 1174 tv_nexus = tpg->tpg_nexus; 1175 if (!tv_nexus) { 1176 pr_err("Missing nexus, ignoring command\n"); 1177 return -ENODEV; 1178 } 1179 1180 cmd = usbg_get_cmd(fu, tv_nexus, cbw->Tag); 1181 if (IS_ERR(cmd)) { 1182 pr_err("usbg_get_cmd failed\n"); 1183 return -ENOMEM; 1184 } 1185 memcpy(cmd->cmd_buf, cbw->CDB, cmd_len); 1186 1187 cmd->bot_tag = cbw->Tag; 1188 cmd->prio_attr = TCM_SIMPLE_TAG; 1189 cmd->unpacked_lun = cbw->Lun; 1190 cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0; 1191 cmd->data_len = le32_to_cpu(cbw->DataTransferLength); 1192 cmd->se_cmd.tag = le32_to_cpu(cmd->bot_tag); 1193 1194 INIT_WORK(&cmd->work, bot_cmd_work); 1195 queue_work(tpg->workqueue, &cmd->work); 1196 1197 return 0; 1198 } 1199 1200 /* Start fabric.c code */ 1201 1202 static int usbg_check_true(struct se_portal_group *se_tpg) 1203 { 1204 return 1; 1205 } 1206 1207 static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg) 1208 { 1209 struct usbg_tpg *tpg = container_of(se_tpg, 1210 struct usbg_tpg, se_tpg); 1211 struct usbg_tport *tport = tpg->tport; 1212 1213 return &tport->tport_name[0]; 1214 } 1215 1216 static u16 usbg_get_tag(struct se_portal_group *se_tpg) 1217 { 1218 struct usbg_tpg *tpg = container_of(se_tpg, 1219 struct usbg_tpg, se_tpg); 1220 return tpg->tport_tpgt; 1221 } 1222 1223 static void usbg_release_cmd(struct se_cmd *se_cmd) 1224 { 1225 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, 1226 se_cmd); 1227 struct se_session *se_sess = se_cmd->se_sess; 1228 1229 kfree(cmd->data_buf); 1230 target_free_tag(se_sess, se_cmd); 1231 } 1232 1233 static void usbg_queue_tm_rsp(struct se_cmd *se_cmd) 1234 { 1235 } 1236 1237 static void usbg_aborted_task(struct se_cmd *se_cmd) 1238 { 1239 } 1240 1241 static const char *usbg_check_wwn(const char *name) 1242 { 1243 const char *n; 1244 unsigned int len; 1245 1246 n = strstr(name, "naa."); 1247 if (!n) 1248 return NULL; 1249 n += 4; 1250 len = strlen(n); 1251 if (len == 0 || len > USBG_NAMELEN - 1) 1252 return NULL; 1253 return n; 1254 } 1255 1256 static int usbg_init_nodeacl(struct se_node_acl *se_nacl, const char *name) 1257 { 1258 if (!usbg_check_wwn(name)) 1259 return -EINVAL; 1260 return 0; 1261 } 1262 1263 static struct se_portal_group *usbg_make_tpg(struct se_wwn *wwn, 1264 const char *name) 1265 { 1266 struct usbg_tport *tport = container_of(wwn, struct usbg_tport, 1267 tport_wwn); 1268 struct usbg_tpg *tpg; 1269 unsigned long tpgt; 1270 int ret; 1271 struct f_tcm_opts *opts; 1272 unsigned i; 1273 1274 if (strstr(name, "tpgt_") != name) 1275 return ERR_PTR(-EINVAL); 1276 if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX) 1277 return ERR_PTR(-EINVAL); 1278 ret = -ENODEV; 1279 mutex_lock(&tpg_instances_lock); 1280 for (i = 0; i < TPG_INSTANCES; ++i) 1281 if (tpg_instances[i].func_inst && !tpg_instances[i].tpg) 1282 break; 1283 if (i == TPG_INSTANCES) 1284 goto unlock_inst; 1285 1286 opts = container_of(tpg_instances[i].func_inst, struct f_tcm_opts, 1287 func_inst); 1288 mutex_lock(&opts->dep_lock); 1289 if (!opts->ready) 1290 goto unlock_dep; 1291 1292 if (opts->has_dep) { 1293 if (!try_module_get(opts->dependent)) 1294 goto unlock_dep; 1295 } else { 1296 ret = configfs_depend_item_unlocked( 1297 wwn->wwn_group.cg_subsys, 1298 &opts->func_inst.group.cg_item); 1299 if (ret) 1300 goto unlock_dep; 1301 } 1302 1303 tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL); 1304 ret = -ENOMEM; 1305 if (!tpg) 1306 goto unref_dep; 1307 mutex_init(&tpg->tpg_mutex); 1308 atomic_set(&tpg->tpg_port_count, 0); 1309 tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 1310 WQ_UNBOUND, WQ_UNBOUND_MAX_ACTIVE); 1311 if (!tpg->workqueue) 1312 goto free_tpg; 1313 1314 tpg->tport = tport; 1315 tpg->tport_tpgt = tpgt; 1316 1317 /* 1318 * SPC doesn't assign a protocol identifier for USB-SCSI, so we 1319 * pretend to be SAS.. 1320 */ 1321 ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_SAS); 1322 if (ret < 0) 1323 goto free_workqueue; 1324 1325 tpg_instances[i].tpg = tpg; 1326 tpg->fi = tpg_instances[i].func_inst; 1327 mutex_unlock(&opts->dep_lock); 1328 mutex_unlock(&tpg_instances_lock); 1329 return &tpg->se_tpg; 1330 1331 free_workqueue: 1332 destroy_workqueue(tpg->workqueue); 1333 free_tpg: 1334 kfree(tpg); 1335 unref_dep: 1336 if (opts->has_dep) 1337 module_put(opts->dependent); 1338 else 1339 configfs_undepend_item_unlocked(&opts->func_inst.group.cg_item); 1340 unlock_dep: 1341 mutex_unlock(&opts->dep_lock); 1342 unlock_inst: 1343 mutex_unlock(&tpg_instances_lock); 1344 1345 return ERR_PTR(ret); 1346 } 1347 1348 static int tcm_usbg_drop_nexus(struct usbg_tpg *); 1349 1350 static void usbg_drop_tpg(struct se_portal_group *se_tpg) 1351 { 1352 struct usbg_tpg *tpg = container_of(se_tpg, 1353 struct usbg_tpg, se_tpg); 1354 unsigned i; 1355 struct f_tcm_opts *opts; 1356 1357 tcm_usbg_drop_nexus(tpg); 1358 core_tpg_deregister(se_tpg); 1359 destroy_workqueue(tpg->workqueue); 1360 1361 mutex_lock(&tpg_instances_lock); 1362 for (i = 0; i < TPG_INSTANCES; ++i) 1363 if (tpg_instances[i].tpg == tpg) 1364 break; 1365 if (i < TPG_INSTANCES) { 1366 tpg_instances[i].tpg = NULL; 1367 opts = container_of(tpg_instances[i].func_inst, 1368 struct f_tcm_opts, func_inst); 1369 mutex_lock(&opts->dep_lock); 1370 if (opts->has_dep) 1371 module_put(opts->dependent); 1372 else 1373 configfs_undepend_item_unlocked( 1374 &opts->func_inst.group.cg_item); 1375 mutex_unlock(&opts->dep_lock); 1376 } 1377 mutex_unlock(&tpg_instances_lock); 1378 1379 kfree(tpg); 1380 } 1381 1382 static struct se_wwn *usbg_make_tport( 1383 struct target_fabric_configfs *tf, 1384 struct config_group *group, 1385 const char *name) 1386 { 1387 struct usbg_tport *tport; 1388 const char *wnn_name; 1389 u64 wwpn = 0; 1390 1391 wnn_name = usbg_check_wwn(name); 1392 if (!wnn_name) 1393 return ERR_PTR(-EINVAL); 1394 1395 tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL); 1396 if (!(tport)) 1397 return ERR_PTR(-ENOMEM); 1398 1399 tport->tport_wwpn = wwpn; 1400 snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name); 1401 return &tport->tport_wwn; 1402 } 1403 1404 static void usbg_drop_tport(struct se_wwn *wwn) 1405 { 1406 struct usbg_tport *tport = container_of(wwn, 1407 struct usbg_tport, tport_wwn); 1408 kfree(tport); 1409 } 1410 1411 /* 1412 * If somebody feels like dropping the version property, go ahead. 1413 */ 1414 static ssize_t usbg_wwn_version_show(struct config_item *item, char *page) 1415 { 1416 return sprintf(page, "usb-gadget fabric module\n"); 1417 } 1418 1419 CONFIGFS_ATTR_RO(usbg_wwn_, version); 1420 1421 static struct configfs_attribute *usbg_wwn_attrs[] = { 1422 &usbg_wwn_attr_version, 1423 NULL, 1424 }; 1425 1426 static int usbg_attach(struct usbg_tpg *); 1427 static void usbg_detach(struct usbg_tpg *); 1428 1429 static int usbg_enable_tpg(struct se_portal_group *se_tpg, bool enable) 1430 { 1431 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1432 int ret = 0; 1433 1434 if (enable) 1435 ret = usbg_attach(tpg); 1436 else 1437 usbg_detach(tpg); 1438 if (ret) 1439 return ret; 1440 1441 tpg->gadget_connect = enable; 1442 1443 return 0; 1444 } 1445 1446 static ssize_t tcm_usbg_tpg_nexus_show(struct config_item *item, char *page) 1447 { 1448 struct se_portal_group *se_tpg = to_tpg(item); 1449 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1450 struct tcm_usbg_nexus *tv_nexus; 1451 ssize_t ret; 1452 1453 mutex_lock(&tpg->tpg_mutex); 1454 tv_nexus = tpg->tpg_nexus; 1455 if (!tv_nexus) { 1456 ret = -ENODEV; 1457 goto out; 1458 } 1459 ret = sysfs_emit(page, "%s\n", 1460 tv_nexus->tvn_se_sess->se_node_acl->initiatorname); 1461 out: 1462 mutex_unlock(&tpg->tpg_mutex); 1463 return ret; 1464 } 1465 1466 static int usbg_alloc_sess_cb(struct se_portal_group *se_tpg, 1467 struct se_session *se_sess, void *p) 1468 { 1469 struct usbg_tpg *tpg = container_of(se_tpg, 1470 struct usbg_tpg, se_tpg); 1471 1472 tpg->tpg_nexus = p; 1473 return 0; 1474 } 1475 1476 static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name) 1477 { 1478 struct tcm_usbg_nexus *tv_nexus; 1479 int ret = 0; 1480 1481 mutex_lock(&tpg->tpg_mutex); 1482 if (tpg->tpg_nexus) { 1483 ret = -EEXIST; 1484 pr_debug("tpg->tpg_nexus already exists\n"); 1485 goto out_unlock; 1486 } 1487 1488 tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL); 1489 if (!tv_nexus) { 1490 ret = -ENOMEM; 1491 goto out_unlock; 1492 } 1493 1494 tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg, 1495 USB_G_DEFAULT_SESSION_TAGS, 1496 sizeof(struct usbg_cmd), 1497 TARGET_PROT_NORMAL, name, 1498 tv_nexus, usbg_alloc_sess_cb); 1499 if (IS_ERR(tv_nexus->tvn_se_sess)) { 1500 #define MAKE_NEXUS_MSG "core_tpg_check_initiator_node_acl() failed for %s\n" 1501 pr_debug(MAKE_NEXUS_MSG, name); 1502 #undef MAKE_NEXUS_MSG 1503 ret = PTR_ERR(tv_nexus->tvn_se_sess); 1504 kfree(tv_nexus); 1505 } 1506 1507 out_unlock: 1508 mutex_unlock(&tpg->tpg_mutex); 1509 return ret; 1510 } 1511 1512 static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg) 1513 { 1514 struct se_session *se_sess; 1515 struct tcm_usbg_nexus *tv_nexus; 1516 int ret = -ENODEV; 1517 1518 mutex_lock(&tpg->tpg_mutex); 1519 tv_nexus = tpg->tpg_nexus; 1520 if (!tv_nexus) 1521 goto out; 1522 1523 se_sess = tv_nexus->tvn_se_sess; 1524 if (!se_sess) 1525 goto out; 1526 1527 if (atomic_read(&tpg->tpg_port_count)) { 1528 ret = -EPERM; 1529 #define MSG "Unable to remove Host I_T Nexus with active TPG port count: %d\n" 1530 pr_err(MSG, atomic_read(&tpg->tpg_port_count)); 1531 #undef MSG 1532 goto out; 1533 } 1534 1535 pr_debug("Removing I_T Nexus to Initiator Port: %s\n", 1536 tv_nexus->tvn_se_sess->se_node_acl->initiatorname); 1537 /* 1538 * Release the SCSI I_T Nexus to the emulated vHost Target Port 1539 */ 1540 target_remove_session(se_sess); 1541 tpg->tpg_nexus = NULL; 1542 1543 kfree(tv_nexus); 1544 ret = 0; 1545 out: 1546 mutex_unlock(&tpg->tpg_mutex); 1547 return ret; 1548 } 1549 1550 static ssize_t tcm_usbg_tpg_nexus_store(struct config_item *item, 1551 const char *page, size_t count) 1552 { 1553 struct se_portal_group *se_tpg = to_tpg(item); 1554 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1555 unsigned char i_port[USBG_NAMELEN], *ptr; 1556 int ret; 1557 1558 if (!strncmp(page, "NULL", 4)) { 1559 ret = tcm_usbg_drop_nexus(tpg); 1560 return (!ret) ? count : ret; 1561 } 1562 if (strlen(page) >= USBG_NAMELEN) { 1563 1564 #define NEXUS_STORE_MSG "Emulated NAA Sas Address: %s, exceeds max: %d\n" 1565 pr_err(NEXUS_STORE_MSG, page, USBG_NAMELEN); 1566 #undef NEXUS_STORE_MSG 1567 return -EINVAL; 1568 } 1569 snprintf(i_port, USBG_NAMELEN, "%s", page); 1570 1571 ptr = strstr(i_port, "naa."); 1572 if (!ptr) { 1573 pr_err("Missing 'naa.' prefix\n"); 1574 return -EINVAL; 1575 } 1576 1577 if (i_port[strlen(i_port) - 1] == '\n') 1578 i_port[strlen(i_port) - 1] = '\0'; 1579 1580 ret = tcm_usbg_make_nexus(tpg, &i_port[0]); 1581 if (ret < 0) 1582 return ret; 1583 return count; 1584 } 1585 1586 CONFIGFS_ATTR(tcm_usbg_tpg_, nexus); 1587 1588 static struct configfs_attribute *usbg_base_attrs[] = { 1589 &tcm_usbg_tpg_attr_nexus, 1590 NULL, 1591 }; 1592 1593 static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun) 1594 { 1595 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1596 1597 atomic_inc(&tpg->tpg_port_count); 1598 smp_mb__after_atomic(); 1599 return 0; 1600 } 1601 1602 static void usbg_port_unlink(struct se_portal_group *se_tpg, 1603 struct se_lun *se_lun) 1604 { 1605 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); 1606 1607 atomic_dec(&tpg->tpg_port_count); 1608 smp_mb__after_atomic(); 1609 } 1610 1611 static int usbg_check_stop_free(struct se_cmd *se_cmd) 1612 { 1613 return target_put_sess_cmd(se_cmd); 1614 } 1615 1616 static const struct target_core_fabric_ops usbg_ops = { 1617 .module = THIS_MODULE, 1618 .fabric_name = "usb_gadget", 1619 .tpg_get_wwn = usbg_get_fabric_wwn, 1620 .tpg_get_tag = usbg_get_tag, 1621 .tpg_check_demo_mode = usbg_check_true, 1622 .release_cmd = usbg_release_cmd, 1623 .sess_get_initiator_sid = NULL, 1624 .write_pending = usbg_send_write_request, 1625 .queue_data_in = usbg_send_read_response, 1626 .queue_status = usbg_send_status_response, 1627 .queue_tm_rsp = usbg_queue_tm_rsp, 1628 .aborted_task = usbg_aborted_task, 1629 .check_stop_free = usbg_check_stop_free, 1630 1631 .fabric_make_wwn = usbg_make_tport, 1632 .fabric_drop_wwn = usbg_drop_tport, 1633 .fabric_make_tpg = usbg_make_tpg, 1634 .fabric_enable_tpg = usbg_enable_tpg, 1635 .fabric_drop_tpg = usbg_drop_tpg, 1636 .fabric_post_link = usbg_port_link, 1637 .fabric_pre_unlink = usbg_port_unlink, 1638 .fabric_init_nodeacl = usbg_init_nodeacl, 1639 1640 .tfc_wwn_attrs = usbg_wwn_attrs, 1641 .tfc_tpg_base_attrs = usbg_base_attrs, 1642 1643 .default_submit_type = TARGET_DIRECT_SUBMIT, 1644 .direct_submit_supp = 1, 1645 }; 1646 1647 /* Start gadget.c code */ 1648 1649 static struct usb_interface_descriptor bot_intf_desc = { 1650 .bLength = sizeof(bot_intf_desc), 1651 .bDescriptorType = USB_DT_INTERFACE, 1652 .bNumEndpoints = 2, 1653 .bAlternateSetting = USB_G_ALT_INT_BBB, 1654 .bInterfaceClass = USB_CLASS_MASS_STORAGE, 1655 .bInterfaceSubClass = USB_SC_SCSI, 1656 .bInterfaceProtocol = USB_PR_BULK, 1657 }; 1658 1659 static struct usb_interface_descriptor uasp_intf_desc = { 1660 .bLength = sizeof(uasp_intf_desc), 1661 .bDescriptorType = USB_DT_INTERFACE, 1662 .bNumEndpoints = 4, 1663 .bAlternateSetting = USB_G_ALT_INT_UAS, 1664 .bInterfaceClass = USB_CLASS_MASS_STORAGE, 1665 .bInterfaceSubClass = USB_SC_SCSI, 1666 .bInterfaceProtocol = USB_PR_UAS, 1667 }; 1668 1669 static struct usb_endpoint_descriptor uasp_bi_desc = { 1670 .bLength = USB_DT_ENDPOINT_SIZE, 1671 .bDescriptorType = USB_DT_ENDPOINT, 1672 .bEndpointAddress = USB_DIR_IN, 1673 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1674 .wMaxPacketSize = cpu_to_le16(512), 1675 }; 1676 1677 static struct usb_endpoint_descriptor uasp_fs_bi_desc = { 1678 .bLength = USB_DT_ENDPOINT_SIZE, 1679 .bDescriptorType = USB_DT_ENDPOINT, 1680 .bEndpointAddress = USB_DIR_IN, 1681 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1682 }; 1683 1684 static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = { 1685 .bLength = sizeof(uasp_bi_pipe_desc), 1686 .bDescriptorType = USB_DT_PIPE_USAGE, 1687 .bPipeID = DATA_IN_PIPE_ID, 1688 }; 1689 1690 static struct usb_endpoint_descriptor uasp_ss_bi_desc = { 1691 .bLength = USB_DT_ENDPOINT_SIZE, 1692 .bDescriptorType = USB_DT_ENDPOINT, 1693 .bEndpointAddress = USB_DIR_IN, 1694 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1695 .wMaxPacketSize = cpu_to_le16(1024), 1696 }; 1697 1698 static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = { 1699 .bLength = sizeof(uasp_bi_ep_comp_desc), 1700 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1701 .bMaxBurst = 15, 1702 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, 1703 .wBytesPerInterval = 0, 1704 }; 1705 1706 static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = { 1707 .bLength = sizeof(bot_bi_ep_comp_desc), 1708 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1709 .bMaxBurst = 15, 1710 }; 1711 1712 static struct usb_endpoint_descriptor uasp_bo_desc = { 1713 .bLength = USB_DT_ENDPOINT_SIZE, 1714 .bDescriptorType = USB_DT_ENDPOINT, 1715 .bEndpointAddress = USB_DIR_OUT, 1716 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1717 .wMaxPacketSize = cpu_to_le16(512), 1718 }; 1719 1720 static struct usb_endpoint_descriptor uasp_fs_bo_desc = { 1721 .bLength = USB_DT_ENDPOINT_SIZE, 1722 .bDescriptorType = USB_DT_ENDPOINT, 1723 .bEndpointAddress = USB_DIR_OUT, 1724 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1725 }; 1726 1727 static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = { 1728 .bLength = sizeof(uasp_bo_pipe_desc), 1729 .bDescriptorType = USB_DT_PIPE_USAGE, 1730 .bPipeID = DATA_OUT_PIPE_ID, 1731 }; 1732 1733 static struct usb_endpoint_descriptor uasp_ss_bo_desc = { 1734 .bLength = USB_DT_ENDPOINT_SIZE, 1735 .bDescriptorType = USB_DT_ENDPOINT, 1736 .bEndpointAddress = USB_DIR_OUT, 1737 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1738 .wMaxPacketSize = cpu_to_le16(0x400), 1739 }; 1740 1741 static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = { 1742 .bLength = sizeof(uasp_bo_ep_comp_desc), 1743 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1744 .bMaxBurst = 15, 1745 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, 1746 }; 1747 1748 static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = { 1749 .bLength = sizeof(bot_bo_ep_comp_desc), 1750 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1751 .bMaxBurst = 15, 1752 }; 1753 1754 static struct usb_endpoint_descriptor uasp_status_desc = { 1755 .bLength = USB_DT_ENDPOINT_SIZE, 1756 .bDescriptorType = USB_DT_ENDPOINT, 1757 .bEndpointAddress = USB_DIR_IN, 1758 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1759 .wMaxPacketSize = cpu_to_le16(512), 1760 }; 1761 1762 static struct usb_endpoint_descriptor uasp_fs_status_desc = { 1763 .bLength = USB_DT_ENDPOINT_SIZE, 1764 .bDescriptorType = USB_DT_ENDPOINT, 1765 .bEndpointAddress = USB_DIR_IN, 1766 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1767 }; 1768 1769 static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = { 1770 .bLength = sizeof(uasp_status_pipe_desc), 1771 .bDescriptorType = USB_DT_PIPE_USAGE, 1772 .bPipeID = STATUS_PIPE_ID, 1773 }; 1774 1775 static struct usb_endpoint_descriptor uasp_ss_status_desc = { 1776 .bLength = USB_DT_ENDPOINT_SIZE, 1777 .bDescriptorType = USB_DT_ENDPOINT, 1778 .bEndpointAddress = USB_DIR_IN, 1779 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1780 .wMaxPacketSize = cpu_to_le16(1024), 1781 }; 1782 1783 static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = { 1784 .bLength = sizeof(uasp_status_in_ep_comp_desc), 1785 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1786 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, 1787 }; 1788 1789 static struct usb_endpoint_descriptor uasp_cmd_desc = { 1790 .bLength = USB_DT_ENDPOINT_SIZE, 1791 .bDescriptorType = USB_DT_ENDPOINT, 1792 .bEndpointAddress = USB_DIR_OUT, 1793 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1794 .wMaxPacketSize = cpu_to_le16(512), 1795 }; 1796 1797 static struct usb_endpoint_descriptor uasp_fs_cmd_desc = { 1798 .bLength = USB_DT_ENDPOINT_SIZE, 1799 .bDescriptorType = USB_DT_ENDPOINT, 1800 .bEndpointAddress = USB_DIR_OUT, 1801 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1802 }; 1803 1804 static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = { 1805 .bLength = sizeof(uasp_cmd_pipe_desc), 1806 .bDescriptorType = USB_DT_PIPE_USAGE, 1807 .bPipeID = CMD_PIPE_ID, 1808 }; 1809 1810 static struct usb_endpoint_descriptor uasp_ss_cmd_desc = { 1811 .bLength = USB_DT_ENDPOINT_SIZE, 1812 .bDescriptorType = USB_DT_ENDPOINT, 1813 .bEndpointAddress = USB_DIR_OUT, 1814 .bmAttributes = USB_ENDPOINT_XFER_BULK, 1815 .wMaxPacketSize = cpu_to_le16(1024), 1816 }; 1817 1818 static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = { 1819 .bLength = sizeof(uasp_cmd_comp_desc), 1820 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 1821 }; 1822 1823 static struct usb_descriptor_header *uasp_fs_function_desc[] = { 1824 (struct usb_descriptor_header *) &bot_intf_desc, 1825 (struct usb_descriptor_header *) &uasp_fs_bi_desc, 1826 (struct usb_descriptor_header *) &uasp_fs_bo_desc, 1827 1828 (struct usb_descriptor_header *) &uasp_intf_desc, 1829 (struct usb_descriptor_header *) &uasp_fs_bi_desc, 1830 (struct usb_descriptor_header *) &uasp_bi_pipe_desc, 1831 (struct usb_descriptor_header *) &uasp_fs_bo_desc, 1832 (struct usb_descriptor_header *) &uasp_bo_pipe_desc, 1833 (struct usb_descriptor_header *) &uasp_fs_status_desc, 1834 (struct usb_descriptor_header *) &uasp_status_pipe_desc, 1835 (struct usb_descriptor_header *) &uasp_fs_cmd_desc, 1836 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc, 1837 NULL, 1838 }; 1839 1840 static struct usb_descriptor_header *uasp_hs_function_desc[] = { 1841 (struct usb_descriptor_header *) &bot_intf_desc, 1842 (struct usb_descriptor_header *) &uasp_bi_desc, 1843 (struct usb_descriptor_header *) &uasp_bo_desc, 1844 1845 (struct usb_descriptor_header *) &uasp_intf_desc, 1846 (struct usb_descriptor_header *) &uasp_bi_desc, 1847 (struct usb_descriptor_header *) &uasp_bi_pipe_desc, 1848 (struct usb_descriptor_header *) &uasp_bo_desc, 1849 (struct usb_descriptor_header *) &uasp_bo_pipe_desc, 1850 (struct usb_descriptor_header *) &uasp_status_desc, 1851 (struct usb_descriptor_header *) &uasp_status_pipe_desc, 1852 (struct usb_descriptor_header *) &uasp_cmd_desc, 1853 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc, 1854 NULL, 1855 }; 1856 1857 static struct usb_descriptor_header *uasp_ss_function_desc[] = { 1858 (struct usb_descriptor_header *) &bot_intf_desc, 1859 (struct usb_descriptor_header *) &uasp_ss_bi_desc, 1860 (struct usb_descriptor_header *) &bot_bi_ep_comp_desc, 1861 (struct usb_descriptor_header *) &uasp_ss_bo_desc, 1862 (struct usb_descriptor_header *) &bot_bo_ep_comp_desc, 1863 1864 (struct usb_descriptor_header *) &uasp_intf_desc, 1865 (struct usb_descriptor_header *) &uasp_ss_bi_desc, 1866 (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc, 1867 (struct usb_descriptor_header *) &uasp_bi_pipe_desc, 1868 (struct usb_descriptor_header *) &uasp_ss_bo_desc, 1869 (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc, 1870 (struct usb_descriptor_header *) &uasp_bo_pipe_desc, 1871 (struct usb_descriptor_header *) &uasp_ss_status_desc, 1872 (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc, 1873 (struct usb_descriptor_header *) &uasp_status_pipe_desc, 1874 (struct usb_descriptor_header *) &uasp_ss_cmd_desc, 1875 (struct usb_descriptor_header *) &uasp_cmd_comp_desc, 1876 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc, 1877 NULL, 1878 }; 1879 1880 static struct usb_string tcm_us_strings[] = { 1881 [USB_G_STR_INT_UAS].s = "USB Attached SCSI", 1882 [USB_G_STR_INT_BBB].s = "Bulk Only Transport", 1883 { }, 1884 }; 1885 1886 static struct usb_gadget_strings tcm_stringtab = { 1887 .language = 0x0409, 1888 .strings = tcm_us_strings, 1889 }; 1890 1891 static struct usb_gadget_strings *tcm_strings[] = { 1892 &tcm_stringtab, 1893 NULL, 1894 }; 1895 1896 static int tcm_bind(struct usb_configuration *c, struct usb_function *f) 1897 { 1898 struct f_uas *fu = to_f_uas(f); 1899 struct usb_string *us; 1900 struct usb_gadget *gadget = c->cdev->gadget; 1901 struct usb_ep *ep; 1902 struct f_tcm_opts *opts; 1903 int iface; 1904 int ret; 1905 1906 opts = container_of(f->fi, struct f_tcm_opts, func_inst); 1907 1908 mutex_lock(&opts->dep_lock); 1909 if (!opts->can_attach) { 1910 mutex_unlock(&opts->dep_lock); 1911 return -ENODEV; 1912 } 1913 mutex_unlock(&opts->dep_lock); 1914 us = usb_gstrings_attach(c->cdev, tcm_strings, 1915 ARRAY_SIZE(tcm_us_strings)); 1916 if (IS_ERR(us)) 1917 return PTR_ERR(us); 1918 bot_intf_desc.iInterface = us[USB_G_STR_INT_BBB].id; 1919 uasp_intf_desc.iInterface = us[USB_G_STR_INT_UAS].id; 1920 1921 iface = usb_interface_id(c, f); 1922 if (iface < 0) 1923 return iface; 1924 1925 bot_intf_desc.bInterfaceNumber = iface; 1926 uasp_intf_desc.bInterfaceNumber = iface; 1927 fu->iface = iface; 1928 ep = usb_ep_autoconfig(gadget, &uasp_fs_bi_desc); 1929 if (!ep) 1930 goto ep_fail; 1931 1932 fu->ep_in = ep; 1933 1934 ep = usb_ep_autoconfig(gadget, &uasp_fs_bo_desc); 1935 if (!ep) 1936 goto ep_fail; 1937 fu->ep_out = ep; 1938 1939 ep = usb_ep_autoconfig(gadget, &uasp_fs_status_desc); 1940 if (!ep) 1941 goto ep_fail; 1942 fu->ep_status = ep; 1943 1944 ep = usb_ep_autoconfig(gadget, &uasp_fs_cmd_desc); 1945 if (!ep) 1946 goto ep_fail; 1947 fu->ep_cmd = ep; 1948 1949 /* Assume endpoint addresses are the same for both speeds */ 1950 uasp_bi_desc.bEndpointAddress = uasp_fs_bi_desc.bEndpointAddress; 1951 uasp_bo_desc.bEndpointAddress = uasp_fs_bo_desc.bEndpointAddress; 1952 uasp_status_desc.bEndpointAddress = 1953 uasp_fs_status_desc.bEndpointAddress; 1954 uasp_cmd_desc.bEndpointAddress = uasp_fs_cmd_desc.bEndpointAddress; 1955 1956 uasp_ss_bi_desc.bEndpointAddress = uasp_fs_bi_desc.bEndpointAddress; 1957 uasp_ss_bo_desc.bEndpointAddress = uasp_fs_bo_desc.bEndpointAddress; 1958 uasp_ss_status_desc.bEndpointAddress = 1959 uasp_fs_status_desc.bEndpointAddress; 1960 uasp_ss_cmd_desc.bEndpointAddress = uasp_fs_cmd_desc.bEndpointAddress; 1961 1962 ret = usb_assign_descriptors(f, uasp_fs_function_desc, 1963 uasp_hs_function_desc, uasp_ss_function_desc, 1964 uasp_ss_function_desc); 1965 if (ret) 1966 goto ep_fail; 1967 1968 return 0; 1969 ep_fail: 1970 pr_err("Can't claim all required eps\n"); 1971 1972 return -ENOTSUPP; 1973 } 1974 1975 struct guas_setup_wq { 1976 struct work_struct work; 1977 struct f_uas *fu; 1978 unsigned int alt; 1979 }; 1980 1981 static void tcm_delayed_set_alt(struct work_struct *wq) 1982 { 1983 struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq, 1984 work); 1985 struct f_uas *fu = work->fu; 1986 int alt = work->alt; 1987 1988 kfree(work); 1989 1990 if (fu->flags & USBG_IS_BOT) 1991 bot_cleanup_old_alt(fu); 1992 if (fu->flags & USBG_IS_UAS) 1993 uasp_cleanup_old_alt(fu); 1994 1995 if (alt == USB_G_ALT_INT_BBB) 1996 bot_set_alt(fu); 1997 else if (alt == USB_G_ALT_INT_UAS) 1998 uasp_set_alt(fu); 1999 usb_composite_setup_continue(fu->function.config->cdev); 2000 } 2001 2002 static int tcm_get_alt(struct usb_function *f, unsigned intf) 2003 { 2004 struct f_uas *fu = to_f_uas(f); 2005 2006 if (fu->iface != intf) 2007 return -EOPNOTSUPP; 2008 2009 if (fu->flags & USBG_IS_BOT) 2010 return USB_G_ALT_INT_BBB; 2011 else if (fu->flags & USBG_IS_UAS) 2012 return USB_G_ALT_INT_UAS; 2013 2014 return -EOPNOTSUPP; 2015 } 2016 2017 static int tcm_set_alt(struct usb_function *f, unsigned intf, unsigned alt) 2018 { 2019 struct f_uas *fu = to_f_uas(f); 2020 2021 if (fu->iface != intf) 2022 return -EOPNOTSUPP; 2023 2024 if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) { 2025 struct guas_setup_wq *work; 2026 2027 work = kmalloc(sizeof(*work), GFP_ATOMIC); 2028 if (!work) 2029 return -ENOMEM; 2030 INIT_WORK(&work->work, tcm_delayed_set_alt); 2031 work->fu = fu; 2032 work->alt = alt; 2033 schedule_work(&work->work); 2034 return USB_GADGET_DELAYED_STATUS; 2035 } 2036 return -EOPNOTSUPP; 2037 } 2038 2039 static void tcm_disable(struct usb_function *f) 2040 { 2041 struct f_uas *fu = to_f_uas(f); 2042 2043 if (fu->flags & USBG_IS_UAS) 2044 uasp_cleanup_old_alt(fu); 2045 else if (fu->flags & USBG_IS_BOT) 2046 bot_cleanup_old_alt(fu); 2047 fu->flags = 0; 2048 } 2049 2050 static int tcm_setup(struct usb_function *f, 2051 const struct usb_ctrlrequest *ctrl) 2052 { 2053 struct f_uas *fu = to_f_uas(f); 2054 2055 if (!(fu->flags & USBG_IS_BOT)) 2056 return -EOPNOTSUPP; 2057 2058 return usbg_bot_setup(f, ctrl); 2059 } 2060 2061 static inline struct f_tcm_opts *to_f_tcm_opts(struct config_item *item) 2062 { 2063 return container_of(to_config_group(item), struct f_tcm_opts, 2064 func_inst.group); 2065 } 2066 2067 static void tcm_attr_release(struct config_item *item) 2068 { 2069 struct f_tcm_opts *opts = to_f_tcm_opts(item); 2070 2071 usb_put_function_instance(&opts->func_inst); 2072 } 2073 2074 static struct configfs_item_operations tcm_item_ops = { 2075 .release = tcm_attr_release, 2076 }; 2077 2078 static const struct config_item_type tcm_func_type = { 2079 .ct_item_ops = &tcm_item_ops, 2080 .ct_owner = THIS_MODULE, 2081 }; 2082 2083 static void tcm_free_inst(struct usb_function_instance *f) 2084 { 2085 struct f_tcm_opts *opts; 2086 unsigned i; 2087 2088 opts = container_of(f, struct f_tcm_opts, func_inst); 2089 2090 mutex_lock(&tpg_instances_lock); 2091 for (i = 0; i < TPG_INSTANCES; ++i) 2092 if (tpg_instances[i].func_inst == f) 2093 break; 2094 if (i < TPG_INSTANCES) 2095 tpg_instances[i].func_inst = NULL; 2096 mutex_unlock(&tpg_instances_lock); 2097 2098 kfree(opts); 2099 } 2100 2101 static int tcm_register_callback(struct usb_function_instance *f) 2102 { 2103 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2104 2105 mutex_lock(&opts->dep_lock); 2106 opts->can_attach = true; 2107 mutex_unlock(&opts->dep_lock); 2108 2109 return 0; 2110 } 2111 2112 static void tcm_unregister_callback(struct usb_function_instance *f) 2113 { 2114 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2115 2116 mutex_lock(&opts->dep_lock); 2117 unregister_gadget_item(opts-> 2118 func_inst.group.cg_item.ci_parent->ci_parent); 2119 opts->can_attach = false; 2120 mutex_unlock(&opts->dep_lock); 2121 } 2122 2123 static int usbg_attach(struct usbg_tpg *tpg) 2124 { 2125 struct usb_function_instance *f = tpg->fi; 2126 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2127 2128 if (opts->tcm_register_callback) 2129 return opts->tcm_register_callback(f); 2130 2131 return 0; 2132 } 2133 2134 static void usbg_detach(struct usbg_tpg *tpg) 2135 { 2136 struct usb_function_instance *f = tpg->fi; 2137 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2138 2139 if (opts->tcm_unregister_callback) 2140 opts->tcm_unregister_callback(f); 2141 } 2142 2143 static int tcm_set_name(struct usb_function_instance *f, const char *name) 2144 { 2145 struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); 2146 2147 pr_debug("tcm: Activating %s\n", name); 2148 2149 mutex_lock(&opts->dep_lock); 2150 opts->ready = true; 2151 mutex_unlock(&opts->dep_lock); 2152 2153 return 0; 2154 } 2155 2156 static struct usb_function_instance *tcm_alloc_inst(void) 2157 { 2158 struct f_tcm_opts *opts; 2159 int i; 2160 2161 2162 opts = kzalloc(sizeof(*opts), GFP_KERNEL); 2163 if (!opts) 2164 return ERR_PTR(-ENOMEM); 2165 2166 mutex_lock(&tpg_instances_lock); 2167 for (i = 0; i < TPG_INSTANCES; ++i) 2168 if (!tpg_instances[i].func_inst) 2169 break; 2170 2171 if (i == TPG_INSTANCES) { 2172 mutex_unlock(&tpg_instances_lock); 2173 kfree(opts); 2174 return ERR_PTR(-EBUSY); 2175 } 2176 tpg_instances[i].func_inst = &opts->func_inst; 2177 mutex_unlock(&tpg_instances_lock); 2178 2179 mutex_init(&opts->dep_lock); 2180 opts->func_inst.set_inst_name = tcm_set_name; 2181 opts->func_inst.free_func_inst = tcm_free_inst; 2182 opts->tcm_register_callback = tcm_register_callback; 2183 opts->tcm_unregister_callback = tcm_unregister_callback; 2184 2185 config_group_init_type_name(&opts->func_inst.group, "", 2186 &tcm_func_type); 2187 2188 return &opts->func_inst; 2189 } 2190 2191 static void tcm_free(struct usb_function *f) 2192 { 2193 struct f_uas *tcm = to_f_uas(f); 2194 2195 kfree(tcm); 2196 } 2197 2198 static void tcm_unbind(struct usb_configuration *c, struct usb_function *f) 2199 { 2200 usb_free_all_descriptors(f); 2201 } 2202 2203 static struct usb_function *tcm_alloc(struct usb_function_instance *fi) 2204 { 2205 struct f_uas *fu; 2206 unsigned i; 2207 2208 mutex_lock(&tpg_instances_lock); 2209 for (i = 0; i < TPG_INSTANCES; ++i) 2210 if (tpg_instances[i].func_inst == fi) 2211 break; 2212 if (i == TPG_INSTANCES) { 2213 mutex_unlock(&tpg_instances_lock); 2214 return ERR_PTR(-ENODEV); 2215 } 2216 2217 fu = kzalloc(sizeof(*fu), GFP_KERNEL); 2218 if (!fu) { 2219 mutex_unlock(&tpg_instances_lock); 2220 return ERR_PTR(-ENOMEM); 2221 } 2222 2223 fu->function.name = "Target Function"; 2224 fu->function.bind = tcm_bind; 2225 fu->function.unbind = tcm_unbind; 2226 fu->function.set_alt = tcm_set_alt; 2227 fu->function.get_alt = tcm_get_alt; 2228 fu->function.setup = tcm_setup; 2229 fu->function.disable = tcm_disable; 2230 fu->function.free_func = tcm_free; 2231 fu->tpg = tpg_instances[i].tpg; 2232 mutex_unlock(&tpg_instances_lock); 2233 2234 return &fu->function; 2235 } 2236 2237 DECLARE_USB_FUNCTION(tcm, tcm_alloc_inst, tcm_alloc); 2238 2239 static int __init tcm_init(void) 2240 { 2241 int ret; 2242 2243 ret = usb_function_register(&tcmusb_func); 2244 if (ret) 2245 return ret; 2246 2247 ret = target_register_template(&usbg_ops); 2248 if (ret) 2249 usb_function_unregister(&tcmusb_func); 2250 2251 return ret; 2252 } 2253 module_init(tcm_init); 2254 2255 static void __exit tcm_exit(void) 2256 { 2257 target_unregister_template(&usbg_ops); 2258 usb_function_unregister(&tcmusb_func); 2259 } 2260 module_exit(tcm_exit); 2261 2262 MODULE_DESCRIPTION("Target based USB-Gadget"); 2263 MODULE_LICENSE("GPL"); 2264 MODULE_AUTHOR("Sebastian Andrzej Siewior"); 2265